Huck Bolts
Huck Bolts are permanent, high-strength fasteners designed for extreme vibration resistance, high-load applications, and structural durability. Unlike conventional bolts, Huck Bolts provide tamper-proof, maintenance-free connections, making them ideal for railways, bridges, heavy machinery, aerospace, and automotive applications.
At Rajal Industries, we supply precision-engineered Huck Bolts that conform to ASTM, ASME, and manufacturer-specific standards, ensuring high shear and tensile strength, corrosion resistance, and long-lasting reliability in demanding environments.
Sizes & Standards
| Size Range | Standards |
|---|---|
| Diameters: 1/8" to 3/4" | ASTM F844 – General specification for hardened washers used with Huck fasteners |
| Lengths: Variable | ASME B18.2.6 – American standard for high-strength tension control bolts |
| Manufacturer-Specific Standards – Huck bolts comply with proprietary specifications for rail, aerospace, and industrial applications | |
| ISO 12944 – Standard for corrosion protection coatings on fasteners | |
| AAR M-214 – North American railroad standard for Huck fasteners in railcars | |
| EN 14399-6 – European high-strength preloaded bolt standard for Huck fasteners |
Material & Strength Grades
| Material Type | Available Strength Grades | Industry Standards |
|---|---|---|
| Mild Steel & Carbon Steel | 8.8, 10.9, 12.9 | ISO 898-1, ASME B18.2.6 |
| Stainless Steel (Corrosion Resistant) | A2-70 (SS 304), A4-80 (SS 316) | ISO 3506, EN 14399-6 |
| Alloy Steel (Heat Treated) | Class 10.9, 12.9 | ASTM F844, AAR M-214 |
- Heat-Treated for Maximum Performance –Huck bolts undergo quenching and tempering to improve fatigue resistance and tensile strength
- Tensile Strength Ratings::
- Class 8.8 : 830 MPa
- Class 10.9 : 1040 MPa
- Class 12.9 : 1220 MPa
- AAR M-214 Rail-Grade Huck Bolt : 1400 MPa
Head & Huck Locking Mechanism Specifications
Proprietary Locking Collar System for Permanent Fastening
- Huck Bolts use a swaged collar mechanism that locks the pin in place permanently, ensuring zero loosening under vibration.
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- No need for re-tightening, unlike conventional nuts and bolts.
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Tension-Controlled & Shear-Locking Designs
- Available in tension-style Huck Bolts for high-strength load transfer.
- Shear-style Huck Bolts allow controlled load absorption in bridges, railway tracks, and construction.
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- Shear-style Huck Bolts allow controlled load absorption in bridges, railway tracks, and construction.
High-Precision Threading & Machined Body
- Designed for high torque applications, ensuring secure installation and long-term reliability.
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- Compatible with hydraulic, pneumatic, and mechanical installation tools.
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Thread Specifications & Precision Engineering
| Thread Type | Description | Application |
|---|---|---|
| Coarse Thread (UNC/ISO Metric) | Provides high durability and easy installation | Railcars, heavy-duty vehicles, industrial machinery |
| Fine Thread (UNF/Metric Fine) | Allows higher load capacity and better stress distribution | Aerospace, shipbuilding, critical load-bearing applications |
| Tension-Controlled Huck Bolts | Ensures preloaded, high-strength connections | Construction, railway bridges, seismic-resistant structures |
| Shear-Locking Huck Bolts | Provides controlled load transfer and energy absorption | Railroad tracks, heavy steel fabrication |
Thread Fitment & Compliance
- Metric threads conform to ISO 6g tolerances, ensuring reliable load distribution.
- Imperial Huck Bolts comply with AAR M-214 for railroad applications and ASTM F844 for structural use.
Corrosion Resistance & Environmental Suitability
Huck Bolts are used in high-impact, high-vibration environments, requiring protective coatings to extend service life.
| Coating Type | Corrosion Protection Level | Ideal Applications |
|---|---|---|
| Plain Steel (No Coating) | Low | Indoor applications |
| Zinc Plated (Yellow/Blue/White/Black) | Moderate (48-96 hours SST) | General industrial fastening |
| Hot-Dip Galvanized (HDG) | High (600+ hours SST) | Outdoor, railway, and infrastructure applications |
| Dacromet/Geomet Coating | Extreme (1000+ hours SST) | Aerospace, offshore, and shipbuilding applications |
Salt Spray Testing (SST) per ASTM B117 & ISO 9227 ensures long-term rust prevention and durability.
Common Applications of Huck Bolts
- Railroad & Locomotive Manufacturing – Used in railcar chassis, bogies, and track fastenings.
- Bridges & Infrastructure Projects – Ensures high-strength, vibration-resistant connections
- Heavy Machinery & Industrial Equipment – Provides secure fastening in mining, construction, and transport industries.
- Aerospace & Shipbuilding – Used in aircraft assembly, naval construction, and high-performance applications.
- Renewable Energy & Offshore Installations – Essential for wind turbine towers, oil rigs, and marine structures.
Why Choose Rajal Industries for Huck Bolts?
Manufactured to International Standards
Ensuring precision engineering, strength, and compliance.
Permanent Vibration-Resistant Fastening
No re-tightening required, offering maintenance-free performance.
Stringent Quality Control
Huck Bolts undergo torque testing, impact resistance checks, and corrosion testing.
Bulk & Custom Orders
Available in various head styles, coatings, and tension ratings.
Competitive Pricing & On-Time Delivery
Fast turnaround for industrial and infrastructure projects.
Office Address
Plot no.8, Out side of shiyani ni pol, Satavara Para, Behind old bhijanshala, Nr. Jemabhuvani wadi, Bhogava road, Wadhavan, Surendranagar-363030.
Manufacturing Unit
R.S.No. 2912/P, B/h. Meldi maa temple,Old dedadra road, Wadhavan, Surendranagar, Gujarat-363030.
Call us
+91-846 036 2030
+91 8460362030
Email Us
rajalfast@gmail.com sales@rajalindustries.com